Dental-tool holder



(No Model.)

0. M. RICHMOND. DENTAL TOOL HOLDER.

No. 439,427. Patented 0013.28, 1890.

am-ucwtoz audy @513 W mica 1M5 Wit wanes UNITED STATES CASSIUS M. RICHMOND, OF NE\V YORK, N. Y., ASSIGNOR TO THE VVILMING- PATENT OFFICE.

TON DENTAL MANUFACTURING COMPANY, OF WILMINGTON, DELAIVARE.

DENTAL-TOOL HOLDER.

SPECIFICATION forming part of Letters Patent No. 439,427, dated October 28, 1890.

Application filed June 3,1890. Serial No. 354,087. (No model.)

To aZZ whom it may concern:

Be it known that I, CAssIUs M. RICHMOND, of the city, county, and State of New York, have invented a new and useful Improvement in Dental-Tool Holders, of which the following is a specification.

My invention relates to certain devices that are applicable to dental engines as well as all kinds of chucks and tool-holders for lathes; and it consists of a novel construction and arrangement of parts whereby a drill or other tool is expeditiously gripped and released at pleasure.

In order that those skilled in the art to which my invention appertains may know how to make and use the same, I will proceed to describe the construction and operation thereof, referring by letters to the accompanying drawings, in which---- Figure 1 represents a side elevation, Fig. 2 alongitudinal section, and Fig. 3 aperspective view, of the jaw. Fig. 4 is a top view of the holder with the clamp removed. Fig. 5 is a side view of the same; and Fig. 6 is a crossseotion taken at line 0c .12, Fig. 2.

In the several figures of the drawings I have omitted the casing or shield and all means of connection between the mandrel and operating mechanism, as the usual shield and connections are to be used.

A represents an ordinary reamer or drill, the shank of which passes centrally through the nose or forward end of the holder B, which is bored centrally at the rear end, also, to receive the mandrel F. The holder B is recessed or cut away on top or on one side to about half its depth to receive the forward end of the tool-clamp O, and the said holder is also slotted centrally through its diameter to produce a longitudinal slot or channel to receive and within which may vibrate the arm or tail end of the clamp O. The recess cut in the top of the holder is extended slightly at its rear end to form a bearing a (see Fig. 5) for the trunnions D, formed on the sides of the clamp O at about the line of juncture between the head and tail portions, as clearly shown at Fig. 3, so that when the clamp is located in the slot or recess formed in the holder the head of the clamp will lie in the recess in the top of the holder and the tail or rear arm of the clamp will be located in the longitudinal and axial slot formed for its reception, and the trunnions D will lie within the slot extension a, thus forming a pivotal bearing or connection between the clamp and the holder. The tail of the clamp C is beveled on the under side, as clearly shown in Figs. 2 and 3, at E to form an incline, underneath and against which the forward end of the mandrel F is brought to lower and force down the forward end of the clamp to produce a bite or grip upon the shank of the tool. The forward end of the mandrel is formed with a longitudinal slot on one side, and the bottom of said slot is tapered reversely to the incline on the under side of the clamp, so that the forward move or travel of the mandrel will cause it to lift the tail end of the clamp, which, vibrating on the trunnions D, will, as before stated, cause its forward end to grasp and hold the shank of the tool.

At the forward end of the tapered slot formed in the mandrel a small hole is bored through to the lower side and adapted to receive a looking or stop pin G, which passes through and lies within the lower side of the axial and longitudinal slot cut in the holder, and when this pin G is in place the mandrel is permitted to have a proper longitudinal movement to operate the clamp G and at the same time locked against accidental withdrawal.

The forward end of the clamp G, at its lower portion, is extended downwardly to form a shoulder 19, which serves as a stop to limit the movement of the tool, and thus properly seat the same in the nose of the holder.

From the construction and arrangement of parts as described, it will be seen that the tool can be clamped with great force, and that the clamping-lever, which, in the nature of things, must be of limited size, is not weakened by any pivotal holes, as is now used in such devices.

What I claim as new is 1. In combination with the holder B, bored axially and formed with the recess and channel for the reception of the clamp O, the clamp O formed with trunnions D, adapted to pivotscribed, the mandrel F, having its forward end provided with a longitudinal tapered groove, as and for the purpose described.

5. In combination with the holder 13, clamp O, and mandrel F, constructed and arranged as described, the stop-screw G, arranged to limit the movement of the mandrel, as hereinbefore set forth.

CASSIUS M. RICHMOND.

Witnesses:

J. ROMANIE BROWN, ALFRED Di'moN. 

